Former Owner
- Bernardo Bembo1
- Biblioteca Bottigella1
- Biblioteca Trivulziana1
- Breslauer and Meyer1
- Brick Row Book Shop1
- Bruce P. Ferrini1
- Byron Reed1
- C.J. Spence1
- Camillo Riccio1
- Carl Hermann Grabauer1
- Carlo Archinto, 2nd Marquess of Parona, 3rd Count of Trainate1
- Carlo Francesco Frasconi1
- Carlo Morbio1
- Charles Carmichael Lacaita1
- Charles Edward Harris-St. John1
- Charles F. Gunther1
- Charles Fairfax Murray1
- Charles Joseph Harford1
- Charles Lormier1
- Charles Stephen Ascherson1